<h2>
  <ul class="heroes">
    <li *ngFor="let hero of heroes">
      <a routerLink="/detail/{{hero.id}}">
        <span class="badge">{{hero.id}}</span>
        {{hero.name}}
      </a>
      <button class="delete" title="delete hero" (click)="delete(hero)">x</button>
    </li>
  </ul>
</h2>
<div>
  <label>Hero name:
    <input #heroName>
  </label>
  <button (click)="add(heroName.value);heroName.value=''">
    add
  </button>
</div>